Specifications

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Title Explanation
iLBC payload type
Set the RTP payload type of iLBC，and the default value is 97. Accepted
value is 97 ~ 127. The parameter shall be configured in conformity to
that of platform.
G.723.1 rate
Set G.723.1 coding rate，the default value is 6300. The optional
parameters are followings:
l 5300: the Bit rate is 5.3k per second;
l 6300: the Bit rate is 6.3k per second
TOS bits This parameter specifies the quality assurance of services with different
priorities. The factory setting is 0x0C. For the mapping between the
level that has no reliability requirement and the TOS value, seeTable
2-17.
Min. Jitter buffer RTP Jitter Buffer is constructed to reduce the influence brought by
network jitter. This default value is 3. Higher value of this parameter
could result in longer delay, therefore, it should be set with caution.
Max. Jitter buffer RTP Jitter Buffer helps to reduce the influence brought by network
jitter. The default value is 50.
RTP drop SID Determine whether to discard received RTP SID voice packets. By
default, SID voice packets will not be dropped.
Note: RTP SID packets should be dropped only when they are in
unconformity to the specifications. Nonstandard RTP SID data could
generate noise for calls.
Enable VAD Only applicable to G.723, GSM, iLBC. In case of selecting this
parameter, it will not send any voice packet during mute period. By
default, this is selected.
RTP destination
address
This parameter determines where to obtain the IP address of the
receiving side for RTP packets. By default, the IP address is obtained
“From SDP global connection”.
l From SDP global connection: Obtain the IP address from SDP global
connection;
l From SDP media connection: Obtain the IP address from SDP Media
Description.
FoIP
Select fax mode: T.38 or T.30
Jitter buffer Set the extent of T.38 jitter buffer, and the default is 250. The valid
range is 40 ~ 1000 in milliseconds.
Receiving port for
FoIP
Set whether to open a new port when the gateway is switching to T.38
mode, and by default, original voice port will be used.
l Open a new port: Use the new RTP port;
l Use original voice port: Use the original RTP port that created on call
set.
ECM Determine whether to use corrective mode of fax. By default, it is not
selected.
Receive gain Set the receiving gain of T.38 fax, with the default of -6dB.
Transmit gain Set the transmission gain of T.38 fax, with the default of 0dB.
Packet size Set the packet size of T.38. 30 milliseconds is the default value.
Redundancy Set the number of the redundant frames in T.38 data packaget, default is
4.